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This is a very sensitive, sound or voice activated switch which plugs into the REMOTE plug of a tape recorder and turns it on when it detects a preselected level of sound. If the sound continues then the switch will self trigger and remain on. Once the sound goes away then a delay in the circuit will turn off the tape recorder after about 6 seconds. It is ideal for hands free operation of a tape recorder. It has a MIC input, a delay circuit and adjustable sensitivity. Battery holder for 4xAA batteries included. Operating voltage: 6 Volt